Who are "they"?

A Mac should be set up by its owner or whomever intends to use it, in this case your husband. If someone else set it up on his behalf, erase it and start over. Follow these instructions: What to do before you sell, give away, trade in, or recycle your Mac - Apple Support.

Depending on how it was set up you may not be able to comply with those instructions, in which case you should return it for a full cash refund.

Sometimes when setting up a new Mac after erasing and cannot connect to wifi then you must use an ethernet cable and connect to your router then later can change back to wifi.